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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3adc5550ff1f8099238fed815af0d3a2623c3593b7da65bba5213aa874975f8a' 
  AND token = 'arQWZa9oSTMgbKU3X5196xRqlcBNO6qbJCs6AftIPYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}